Filter.



o. 846,859; PATENTED MAR. 12, 1907.

M. e; MELVIN.

- FILTER.

APPLICATION FILED MAY 15. 1906.

Wit" woes 4 I 61mm UNITED STATES PATENT @FFIGE.

MARK G. MELVIN, OF SCRANTON, PENNSYLVANIA, ASSIGNOR OF ONE-FOURTH TOTHOMAS L. ALEXANDER, OF SCRANTON,

PENNSYLVANIA.

FILTER.

Patented March 12, 1907.

Application filed Mayl5, 1906. Serial No. 316,952-

To all whom it may concern:

Be it known that I, MARK G. MnLvmya citizen of the United States, and aresident of Scranton, in the county of Lackawanna and State ofPennsylvania, have invented certain new and useful Improvements inFilters, of Which the following is a specification.

The present invention relates to filters, and in particular to the typeof filters in which a scraper is employed for cleaning the filteringmaterial.

The object of the invention is to provide a filter in which the scraperis automatically actuated when the cleaning-faucet is oper ated.

A further object is to provide improved means whereby the scraper isheld in contin uous engagement with the filtering material.

Other and further objects will appear in the following description, andwill be more particularly pointed out in the appended claims.

The invention is shown in the accompanying drawing, in which Figure 1 isa top view of one embodiment of the invention, partly in section. Fig. 2is a side view partly in section. Fig. 3 is a sectional view showing aslightly-modified form of scraper, and Fig. 4 is a section on anenlarged scale on the line 4 4 of Fig. 3.

Reference will first be had to the embodiment shown in Figs. 1 and 2.The shell of the apparatus consists of an upper half a and a lower halfI), the two halves being screwed together at c. Afiltering-stone d isarranged in the lower half I) and held against the pressure of the waterby a support 6. To the bottom of the part b is connected the faucet ffor drawing off the filtered water. The upper half a, is provided with anipple g for attachment to a piping, and opposite the nipple is a fauceth, by means of which unfiltered water may be drawn through the filter.This faucet will be referred to in the following as the cleaning-faucet.On the top of the part a is a sleeve i, through which projects a shaft9', which terminates in a head 7c, located within the shell of thefilter. Above the shell the shaft is provided with a collar Z, whichprevents the shaft from dropping down, and within the shell the shaft isprovided with a collar m, which prevents the shaft being forced upwardlyby the pressure of the water. A suitable packing is preferably providedbetween the shaft and the sleeve. n is the scraper or cleaner, which isprovided with a ridge 0 of considerable weight. The scraper is connectedto the head 76 by means of pins 10, which are screwed into the ridge 0and pass loosely through perforations in the head. The pins are providedwith stops g near their upper end. The cleaning-faucet h hasoperating-handle T, which is jointed at 1" to a bent lever s, which inturn is jointed at s to a disk 25, which is rotatably mounted on theshaft 7'. A ratchet-wheel u is rigidly secured on the shaft below thedisk t. The disk t carries a pawl c, which is held in engagement withthe ratchet-wheel u by means of a spring w. cap-plate 00 is screwed to,the upper end of the shaft a washer y being inserted between thecap-plate and the disk t.

In the embodiment shown in Figs. 3 and 4 the lower part of the shaft 3'is tubular and provided with a vertical slot 7' through which isinserted a pin q, secured to a stem p, which is screwed into a holder 0.The holder 0 has depending arms 0 which receive the scraper n betweenthem. The scraper is held in position by means of screws a passingthrough perforations in the holder-arms and in the scraper. A layer 2,of elastic material, is interposed between the upper part of the scraperand the holder.

The operation of the device is as follows: Unfiltered water entersthrough the nipple g and passes through the filtering-stone d to thelower part of the shell, from where the filtered water is drawn by 0ening the faucetf.

The impurities containe in the unfiltered water will collect at the topof the filteringstone, and when the filter has been in use for some timea layer of dirt will have been formed on the upper surface of thefilteringstone, which layer will materially impede the working of thefilter. In order to reestablish good working of the filter, the layer ofdirt must be removed, and this is done in the following manner: Thefaucet h is opened by moving the handle 7 from the position shown infull lines in Fig. 1 to the position shown in dotted lines in the samefigure, and water rushes through the upper part of the filter andcarries along with it the loose particles of dirt atthe top of thefiltering-stone. The shifting of the handle 1 causes the disk t to turnthrough the medium of'the bent lever s, and the pawl '0 slides along theratchetwheel u without turning the same. When the faucet is closed, thehandle and the bent lever are returned to the position shown in fulllines in Fig. 1, thereby causing the disk t and the pawl '0 to turn inthe direction of the arrow. This time the pawl carries along with it theratchet wheel, which is secured on the shaft j, and the scraper isconsequently rotated from the position shown in heavy dotted linesinFig. 1 to the position shown in finely-dotted lines in the same figure,and the layer of dirt is scraped; elf from a part of the stone. Thefaucet h is thereupon opened again,

and dirt scraped off by the closingof the faucet passes out with thewater. When the faucet is closed,another part of the stone is cleaned bythe scraper, as the scraper now turns in the direction ofthe arrow fromthe position shown in finely-dotted lines in Fig. 1. The opening andclosing of the cleaning-faucet is repeated until clean water passes outthrough the faucet.

The scraper is held in engagement with the filteringestone by its ownweight and by the heavy weight of the ridge 0, and when the stone wears,due to repeated scraping, the scraper moves downwardly to retain itsposition on the top of the stone, the pins 19 sliding in the perforationof the head is.

The operation of the embodiment shown in Figs. 3 and 4 isidentical tothat of the other embodiment; but in this instance it is the combinedwei ht of the holder 0 that holds the scraper in engagement. with thefiltering-stone, and downward movement of the scraper. is permitted bythepin-and-slot connection g j I I Wish it to be understood that Ilimitmyself to the exact construction shown and described, as variouschanges may be scraper n and do. not. w

made therein without departing from the scope of the invention.

Having thusdescribed myinvention, what I claim as new, and desire tosecure by Let- I ters Patent, is-

1. In a filter, the combination with the shell having a filtering mediumtherein, of a cleaning-faucet, a rotary cleaner in contact with thefiltering medium, and means connecting the cleaning-faucet and thecleaner and transmitting movement from the faucet to the cleaner torotate the cleaner in one direction only.

2. In a filter, the combination with the shell having a filtering mediumtherein, of a cleaning-faucet, a cleaner in contact with the: filteringmedium, and means connecting the cleaning-faucet and the cleaner andtransmitting movement from the faucet to the cleaner when the faucet isturned in one direction only.

3. In a filter, the combination with the a rotary shaft projectingoutside of the shell and held from axial movement therein, meansconnecting the shaft andthe cleaner, a cleaning-faucet havinga handle,and means connecting the handle and the shaftto-trans mit movement fromthe faucet to the shaft and cleaner.

The foregoing s ecificatioir signed, at. the

city of Scranton, t 's 9th day of April, 1906'.

MARK G. MELVIN. In presence of Josnrn F. GILRoY, H. W. MULHOLLAND.

